diff --git a/src/manipulation.js b/src/manipulation.js
index 742ec25433..86e807fc80 100644
--- a/src/manipulation.js
+++ b/src/manipulation.js
@@ -5,6 +5,7 @@ var rinlinejQuery = / jQuery\d+="(?:\d+|null)"/g,
 	rtagName = /<([\w:]+)/,
 	rtbody = /<tbody/i,
 	rhtml = /<|&\w+;/,
+	rchecked = /checked\s*([^=]|=\s*("checked"|'checked'))/i,  // checked="checked" or checked (html5)
 	fcloseTag = function( all, front, tag ) {
 		return rselfClosing.test( tag ) ?
 			all :
@@ -324,7 +325,8 @@ function cloneCopyEvent(orig, ret) {
 function buildFragment( args, nodes, scripts ) {
 	var fragment, cacheable, cached, cacheresults, doc;
 
-	if ( args.length === 1 && typeof args[0] === "string" && args[0].length < 512 && args[0].indexOf("<option") < 0 ) {
+	// webkit does not clone 'checked' attribute of radio inputs on cloneNode, so don't cache if string has a checked
+	if ( args.length === 1 && typeof args[0] === "string" && args[0].length < 512 && args[0].indexOf("<option") < 0 && !rchecked.test( args[0] ) ) {
 		cacheable = true;
 		cacheresults = jQuery.fragments[ args[0] ];
 		if ( cacheresults ) {
diff --git a/test/unit/manipulation.js b/test/unit/manipulation.js
index e387d640eb..409c496357 100644
--- a/test/unit/manipulation.js
+++ b/test/unit/manipulation.js
@@ -197,7 +197,7 @@ test("unwrap()", function() {
 });
 
 var testAppend = function(valueObj) {
-	expect(22);
+	expect(25);
 	var defaultText = 'Try them out:'
 	var result = jQuery('#first').append(valueObj('<b>buga</b>'));
 	equals( result.text(), defaultText + 'buga', 'Check if text appending works' );
@@ -230,6 +230,18 @@ var testAppend = function(valueObj) {
 	ok( jQuery("#sap").append(valueObj( [] )), "Check for appending an empty array." );
 	ok( jQuery("#sap").append(valueObj( "" )), "Check for appending an empty string." );
 	ok( jQuery("#sap").append(valueObj( document.getElementsByTagName("foo") )), "Check for appending an empty nodelist." );
+	
+	reset();
+	jQuery('form:last').append('<input type="radio" id="checkedRadio" checked="checked" />');
+	ok( jQuery('#checkedRadio').is(':checked'), "Append checked radio");	
+
+	reset();
+	jQuery('form:last').append('<input checked =  "checked" id="checkedRadio" type= "radio" />');
+	ok( jQuery('#checkedRadio').is(':checked'), "Append alternately formated checked radio");	
+
+	reset();
+	jQuery('form:last').append('<input checked id="checkedRadio" type= "radio" />');
+	ok( jQuery('#checkedRadio').is(':checked'), "Append HTML5-formated checked radio");	
 
 	reset();
 	jQuery("#sap").append(valueObj( document.getElementById('form') ));